Maverick County is in the northwestern section of the Rio Grande plain region in southwest Texas. The Rio Grande forms Maverick County's western and international border with Mexico; the county is bordered on the north by Kinney County, on the east by Zavala County, and on the south by Webb County. The county is triangular in shape and contains 1,287 square miles, or 824,960 acres. Eagle Pass, the county seat and most populous community, is in southwestern Maverick County on the Union Pacific Railroad, immediately east of the Rio Grande opposite Piedras Negras, Mexico. By 1971 three major highways converged at Eagle Pass: U.S. Highway 277 North followed the Rio Grande to Del Rio and connected with transcontinental U.S. Highway 90; Highway 277 East connected with Carrizo Springs and Laredo, and U.S. Highway 57 joined U.S. Highway 81 at Moore in Frio County, establishing Eagle Pass as the closest international border town to San Antonio. Eagle Pass is also the gateway to Mexico's Central Super Highway 57, which runs from Piedras Negras to Mexico City. Eagle Pass is 425 miles southeast of El Paso, 200 miles southwest of Austin, and 275 miles northwest of Brownsville. Other communities in the county include Quemado, Normandy, and El Indio. The county center lies fourteen miles southeast of Eagle Pass near 28°38' north latitude and 100°18' west longitude. Elevations range from 540 feet in the southern part to 960 feet in the northern part. The topography is level, particularly in the north central part of the county; otherwise the county exhibits slightly undulating terrain. The soils are gray to black, cracking and clayey with high shrink-swell potential. In some areas they are light colored and loamy with limestone bedrock. Native grasses are short to mid height. Less than 1 percent of the land is considered prime farmland. The terrain along the Rio Grande is characterized by rough hills overlooking a mile-wide stretch of irrigated farmland. The Rio Grande drains the western half of the county and the Nueces River the eastern half. The principal source of water for domestic and agricultural use is the Rio Grande; irrigation water is channeled through conduits of the Maverick County Irrigation Canal system for agricultural production. Water wells tap the Carrizo Springs aquifer along the county's eastern edge; a few wells are located within gravel beds along the Rio Grande. Scattered mesquite, some live oak, cat's claw, huajilla, cenizo, and prickly pear are the predominate flora. Wildlife in the 1980s not subject to hunting regulation included javelina, squirrel, bobcat, and coyote; those subject to hunting regulation included white-tail deer, quail, muskrat, beaver, opossum, ring-tailed cat, badger, fox, weasel, raccoon, skunk, civet cat, turkey, sandhill crane, duck, coot, geese, woodcock, jacksnipe, teal duck, rail, gallinule, and mourning and white-wing dove. The Rio Grande mountain lion, once common in the county, has been the victim of indiscriminate hunting and is an extremely rare visitor today. The climate in Maverick County has been described as subtropical steppe. Temperatures in the summer are consistently high (a record high of 115° F has occurred on several dates) but are mitigated by low humidity and a steady southeasterly breeze. Winter temperatures are mild and dry, dropping to freezing an average of one out of every four days from December 3 through February 21; farmers can expect an average growing season of 285 days annually. Total annual precipitation, the greatest quantity of which occurs during thunderstorms, can vary greatly (6.01 inches in 1956 and 44.36 inches in 1900) and averaged 19.52 inches annually from 1939–68.
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